package com.dbh.lock;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

/**
 *  ThreadLocal示例
 *      ThreadLocal只是起到容器作用，需要在应用层保证为每个线程分配到不同的对象。
 *
 * @author dongbanghui
 * @date 2018/06/02
 */
public class ThreadLocalDemo {

    static ThreadLocal<SimpleDateFormat> t1 = new ThreadLocal<>();

    public static class ParseDate implements Runnable {

        int i = 0;

        public ParseDate(int i){
            this.i = i;
        }

        @Override
        public void run() {
            try {
                if(t1.get()==null){
                    t1.set(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"));
                }
                Date t = t1.get().parse("2015-03-29 19:29:" + i % 60);
                System.out.println(i + ":" + t);
            } catch (ParseException e) {
                e.printStackTrace();
            }
        }
    }

    public static void main(String[] args) {
        ExecutorService es = Executors.newFixedThreadPool(10);
        for(int i=0;i<1000;i++){
            es.execute(new ParseDate(i));
        }
    }

}
